NORTH PACIFIC OPHIURANS IN NATIONAL MUSEUM CLARK. 187 



Locality. Albatross station 4979, oil' eastern Japan, lat. 33 53' X.; 

 long. 137 42' E., 943 fathoms, brown mud, fine sand, foraminifera, 

 bottom temperature 36.4, 1 specimen. 



Ti/jte.Cat, No. 25636, U.S.N.M., from station 4979. 



The groups of granular papilla^ near the distal end of the mouth 

 slits are very peculiar, giving a characteristic appearance to the oral 

 region, and indicate a possible relationship to Oplnocamax litliosora. 

 Whether the sunken 

 appearance of the ra- 

 dial shields and the 

 correspondingly re- 

 markable division of 

 the disk into fifteen 

 wedge-shaped parts 

 is characteristic of 

 the species or only an 

 accentuated individ- 

 ual peculiarity can 

 not, of course, be de- 

 term i ne d without 

 more material. But 

 it is hard to doubt 

 that the main fea- 

 tures of the peculiar 

 disk will be found to 

 be characteristic of 

 the species. 



OPHIOMITRA POLYA- 

 CANTHA, new species." 



Disk 6 mm. in di- 

 ameter; arms about 

 30 mm. long. Disk 

 circular, covered 

 with numerous 

 small rather regular FIG. 86. OFHIOMITRA POLYACANTHA. x 8. a. FROM ABOVE: 6, FROM 

 * * . BELOW; c, SIDE VIEW OF TWO ARM JOINTS NEAR DISK. 



scales, many of which 



bear each a low, thorn}?- stump. Radial shields small, triangular or 

 squarish, about as wide as long, distinctly separated. Upper arm 

 plates small, rhombic or triangular, with convex distal margin, widely 

 separated from each other; between the upper arm plates the arm is 

 somewhat constricted. Tnterbrachial spaces below, covered with 



jf , signifying many and anavda, signifying spine, in reference to the large 

 number of arm spines. 



